Etzler, a 6-8 power forward who committed in May, is the No. 7 prospect in the state in his class.
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Holtmann signed the No. 14 class in the country last November and the No. 27 class in 2018.
Ohio State’s 2019 class was No. 1 in the Big Ten while his first ranked No. 6 in the conference.
He began his Ohio State coaching tenure by bringing four-star forward Kyle Young of Massillon Jackson with him from Butler and signing three-star guard Musa Jallow of Bloomington (Ind.) North.
They joined Kaleb Wesson, a four-star center from Westerville South who signed while Thad Matta was still the coach of the Buckeyes.
In 2018, Holtmann signed Luther Muhammad, a four-star guard from Jersey City (N.J.) Hudson Catholic, four-star power forward Jaedon LeDee of Houston (Texas) The Kinkaid School, three-star guard Duane Washington of Chatsworth (Calif.) Sierra Canyon and three-star small forward Justin Ahrens of Versailles. (Lee has since transferred to TCU.)
The incoming class includes three four-stars in point guard DJ Carton of Bettendorf, Iowa, and forwards EJ Liddell of Belleville (Ill.) West and Alonzo Gaffney of Wolfeboro (N.H.) Brewster Academy along with three-star center Ibrahima Diallo of Napa (Calif.) Prolific Prep.
Gaffney is a Northeast Ohio native who previously played at Garfield Heights with Johnson.